Steady-State and Transient Simulation of Turbodrop Engine Using SIMULINK® Model

Abstract

A performance simulation model of the PT6A-62 turboprop engine using the SIMULINK® was proposed to predict transient and steady state behaviors. This SIMULINK has some advantages such as user-friendly circumstance due to the GUI (Graphic User Interfaces) and ease in modification of the computer program. The SIMULINK model consists of subsystems to represent engine gas path components such as flight initial subsystem, compressor subsystem, burner subsystem, compressor turbine subsystem, power turbine, exhaust nozzle subsystem and integrator subsystem. In addition to these subsystems, there are search subsystems to search an appropriate operating point by scaling from the 2-D components look-up table, error matching subsystem to calculate the gas property precisely. In case of steady state validation, performance parameters analyzed by the proposed SIMULINK model were compared with the analysis results by commercial GASTURB program. In the validation of the transient model, the produced dynamic simulation results were compared with analysis results produced by a well-proved computer program using FORTRAN. In performance analysis of the PT6A-62 turboprop engine by the developed SIMULINK model, the steady state simulation was performed at off design points with altitude variation and part throttle, and the transient simulations with step fuel increases for accelerating the engine were carried out from 64% rpm (idle speed) to 94%rpm. In this investigation, the maximum error in all steady state off-design points in part load cases was within 7.33%. In case of transient analysis with different step fuel increases, the acceleration times using the SIMULINK model were well agreed with experimental values, and also the times calculated by the well proven FORTRAN program.

Transient Behavior in Variable Geometry Industrial Gas Turbines: A Comprehensive Overview of Pertinent Modeling Techniques

“…Variety of commercial and limited use in-house built software have been employed in the literature for transient modeling and validation of the developed models, i.e., GateCycle [ 40 , 45 ], DESTUR [ 26 ], GETRAN [ 58 , 219 ], TURBOMATCH [ 51 , 220 ], AMESim [ 42 ], Thermoflow [ 7 ], DYNGEN [ 32 , 221 ]. TERTS [ 222 ], TURBOTRANS [ 223 , 224 ], and FORTRAN based programs [ 50 , 51 , 206 , 225 ].…”

“…The study proved to be helpful for estimation of air and fuel flow time variation rates along with air temperature. The others motives that incited researchers for transient simulations are performance prediction [ 32 , 48 , 49 , 50 , 51 , 52 ] and compressor and nozzle performance maps evaluation [ 53 ]. The modeling and simulation of an engine involve various other factors that influence the transient behavior through one or other way.…”

Identification of a mathematical model for a single-shaft power-generating GTE

“…The first group includes MMs implemented in such programs as SIMULINK/MATLAB and EcosimPro, which are not software packages of engine characteristics modelling but enable solving system of nonlinear equations belonging to the MMs of GTE. The following ones can be mentioned among them: Dymola (based on Modelica programming language) [2,3], Simulink (integrated into the MATLAB environment) [4,5], TRANSEO (based on the MATLAB environment) [6], PROOSIS (based on the Ecos-imPro system) [7] and others allowing the solution of a wide range of prediction tasks.…”

Comparative Analysis of the Computer-Aided Systems of Gas Turbine Engine Designing

“…The first one includes the CAE systems developed on the basis of universal software tools, such as Dymola that is developed using the Modelica programming language [1]- [3], Simulink [3]- [7] and TRANSEO [8] that are integrated into the MATLAB environment, PROOSIS that is developed using the EcosimPro [9] and others. The second one includes the specialized software, such as DCOGEN [10], DVIGwT [11], [12], EngineSim [13], GasTurb [6], [7], [14], [15], Graphical Engine Cycle Analysis Tool (GECAT) [16], Gas turbine Simulation Program (GSP) [17], Numerical Propulsion System Simulation (NPSS) [3], [18], TERA [19], Uni_TTF [20], WebEngine [21], ASTRA [22]- [24] and others. The second group includes the software, developed at the engine design departments (e.g.…”